The Aero 2536 "Catalina" MkII is an updated concept for a sci-fi flying boat. It is more streamlined and has modified features.
It is a spacecraft3 vessel and as such requires the spacecraft3 addon.
catalina+0.1.zip contains:
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mesh with improved topology (basic visual comparison)
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initialsiation file with various features: new docking configuration, modified animations, added attachment point
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two scenarios: catalina at Gran Canarias and catalina at ISS
It does not use textures, but go ahead and add your own if you want. Installation should replace the old catalina.zip files (which is presumably a good thing).
For more details see readme.txt in the linked catalina+0.1.zip file.29/03/2014
For some simple force calculations for this interpretation of the concept see envelopefigures-catalina.txt.